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"Video cache" is our term for what is now the standard source for subtitling: Video clips saved on a hard drive. When the term was coined (we believe by Screen Electronics who named it "vidcache") the picture source was still video tape. We don't think anyone works with video tape as a source anymore. Nevertheless - just in case - we have kept the old routines for live video input and recording.
Enough said. Nowadays tv stations and dvd/bluray producers use digital video. We think it's here to stay.